1. These giant sea plants are actually a species of large brown algae found in the Pacific Ocean and in the southern ocean near South America, South Africa and Australia. They grow in dense stands known as kelp forest, which are home to many water animals
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2. This free-floating perennial aquatic plant is native  to tropical South America. It has feathery, freely hanging purple-black roots and beautiful purple and pink flowers. It grows vigorously and can double it's  population in two weeks. 
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3. This floating plant has huge spongy leaves without stems, and root hanging submersed beneath the floating Leaves. They are found in nearly all tropical and subtropical fresh water-bodies. 
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4. These floating plants have small flowers with five yellow or white petals. Some species of these plants are aquatic weeds.
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This free-floating water plant grows commonly in stagnant water. It lacks an obvious stem or leaves. This plant is eaten as food in many parts of Asia. 
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